Don't know the code. Happen when I came off the beltway 95n geeting on the off ramp exit 53 caton ave balto. Md. On the ramp I reduced speed to about 25-30mph but the car wouldn't shift pas 3rd gear. Plus it was a hot day and I was driveing for 2 hours

You'll have to have a proper diagnostic test performed, to determine why the light came on, and how it impacts the transmission performance. The check engine light indicates that you will indeed have some clues in the processor's memory. Good luck.